1530s, from un- (2) "reverse, opposite of" + twist (v.). Related: Untwisted; untwisting.

"not to be sanctioned or permitted, inadmissible," mid-15c., from dis- "not, reverse of" + allowable.

Old English uncnyttan; see un- (2) "reverse" + knit (v.). Related: Unknitted; unknitting.

c. 1600, from un- (2) "reverse, opposite of" + clog (v.). Related: Unclogged; unclogging.

1713 (transitive), from un- (2) "reverse, opposite of" + coil (v.). Related: Uncoiled; uncoiling.

early 14c., from un- (2) "reverse of" + cover (v.). Earliest use is figurative; literal sense is attested from late 14c. Related: Uncovered; uncovering.

1530s, "to unload" (transitive), from un- (2) "reverse of" + burden (v.). Similar formation in German entbürden. Reflexive sense is recorded from 1580s. Related: Unburdened; unburdening.

"remove the stopper from," late 14c., from un- (2) "reverse, opposite of" + stop (v.). Related: Unstopped; unstopping.

1580s in figurative sense, c. 1600 in literal sense (transitive and intransitive), from un- (2) "reverse, opposite of" + mask (v.). Related: Unmasked; unmasking.

"remove the cargo from," Old English onhladen; see un- (2) "reverse, opposite of" + lade (v.). Related: Unladen; unlading.